/* Copyright 2016 Lee Cho Kang.
* email: pzesseto@gmail.com
* This file is part of the RbTableHeaderView.
*
* The RbTableHeaderView is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* The RbTableHeaderView is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the RbTableHeaderView. If not, see http://www.gnu.org/licenses/.
*/
/*
 * RbTableHeaderView.h
 *  Created on: 2016. 6. 13.
 */

#include "RbTableHeaderView.h"
#include <QPainter>
#include <QStandardItem>
#include <QMouseEvent>

RbTableHeaderItem::RbTableHeaderItem(RbTableHeaderItem* parent):
   row_prop(0),column_prop(0),parent_item(parent)
{
}

RbTableHeaderItem::RbTableHeaderItem(int arow, int acolumn, RbTableHeaderItem* parent):
	row_prop(arow),column_prop(acolumn),parent_item(parent)
{
}

RbTableHeaderItem::~RbTableHeaderItem()
{
}

RbTableHeaderItem* RbTableHeaderItem::insertChild(int row, int col)
{
	RbTableHeaderItem* newChild = new RbTableHeaderItem(row,col,this);
   child_items.insert(QPair<int,int>(row,col),newChild);
	return newChild;
}

const RbTableHeaderItem* RbTableHeaderItem::child(int row,int col) const
{
	QHash<QPair<int,int>,RbTableHeaderItem*>::const_iterator itr = child_items.find(QPair<int,int>(row,col));
	if (itr != child_items.end()) return itr.value();
	return 0;
}

RbTableHeaderItem* RbTableHeaderItem::child(int row,int col)
{
	QHash<QPair<int,int>,RbTableHeaderItem*>::iterator itr = child_items.find(QPair<int,int>(row,col));
	if (itr != child_items.end()) return itr.value();
	return 0;
}

void RbTableHeaderItem::setText(const QString& text)
{
	role_datas.insert(Qt::DisplayRole,text);
}

QVariant RbTableHeaderItem::data(int role) const
{
	QHash<int,QVariant>::const_iterator itr = role_datas.find(role);
	if (itr != role_datas.end()) return itr.value();
	return QVariant();
}

void RbTableHeaderItem::setData(const QVariant& data, int role)
{
	role_datas.insert(role,data);
}

void RbTableHeaderItem::clear()
{
	QList<RbTableHeaderItem*> items = child_items.values();
	foreach (RbTableHeaderItem* item, child_items)
	{
		if (item) delete item;
	}
	 child_items.clear();
}

RbTableHeaderModel::RbTableHeaderModel(int rows, int cols, QObject* parent) :
QAbstractTableModel(parent),row_count_prop(rows),column_count_prop(cols),root_item(new RbTableHeaderItem())
{
}

RbTableHeaderModel::~RbTableHeaderModel()
{
	root_item->clear();
	delete root_item;
}

QModelIndex RbTableHeaderModel::index(int row, int column, const QModelIndex & parent) const
{
	if (!hasIndex(row,column,parent)) return QModelIndex();

	RbTableHeaderItem* parentItem;
	if (!parent.isValid()) parentItem = root_item; // parent item is always the root_item on table model
	else parentItem = static_cast<RbTableHeaderItem*>(parent.internalPointer()); // no effect

	RbTableHeaderItem* childItem = parentItem->child(row,column);
	if (!childItem) childItem = parentItem->insertChild(row,column);
	return createIndex(row,column,childItem);

	return QModelIndex();
}

QVariant RbTableHeaderModel::data(const QModelIndex& index, int role) const
{
	if (!index.isValid())
		return QVariant();

	if (index.row() >= row_count_prop || index.row() < 0 || index.column() >= column_count_prop || index.column() < 0)
		return QVariant();

	RbTableHeaderItem* item = static_cast<RbTableHeaderItem*>(index.internalPointer());

	return item->data(role);
}

bool RbTableHeaderModel::setData(const QModelIndex & index, const QVariant & value, int role)
{
	if (index.isValid())
	{
		 RbTableHeaderItem* item = static_cast<RbTableHeaderItem*>(index.internalPointer());
		 if (role == COLUMN_SPAN_ROLE)
		 {
			 int col = index.column();
			 int span = value.toInt();
			 if (span > 0) // span size should be more than 1, else nothing to do
			 {
				 if (col+span-1 >= column_count_prop) // span size should be less than whole columns,
					 span = column_count_prop-col;
				 item->setData(span,COLUMN_SPAN_ROLE);
			 }
		 }
		 else if (role == ROW_SPAN_ROLE)
		 {
			 int row = index.row();
			 int span = value.toInt();
			 if (span > 0) // span size should be more than 1, else nothing to do
			 {
				 if (row+span-1 >= row_count_prop)
					 span = row_count_prop-row;
				 item->setData(span,ROW_SPAN_ROLE);
			 }
		 }
		 else
		 item->setData(value,role);

		return true;
	}
	return false;
}

Qt::ItemFlags RbTableHeaderModel::flags(const QModelIndex &index) const
{
	if (!index.isValid())
		return Qt::ItemIsEnabled;
	return QAbstractTableModel::flags(index) | Qt::ItemIsEditable;
}


RbTableHeaderView::RbTableHeaderView(Qt::Orientation orientation, int rows, int columns, QWidget* parent):
		QHeaderView(orientation,parent)
{
	QSize baseSectionSize;
	if (orientation == Qt::Horizontal)
	{
		baseSectionSize.setWidth(defaultSectionSize());
		baseSectionSize.setHeight(20);
	}
	else
	{
		baseSectionSize.setWidth(50);
		baseSectionSize.setHeight(defaultSectionSize());
	}

    // create header model
	RbTableHeaderModel* headerModel = new RbTableHeaderModel(rows,columns);

	// set default size of item
	for (int row=0;row<rows;++row)
		for (int col=0;col<columns;++col)
			headerModel->setData(headerModel->index(row,col),baseSectionSize,Qt::SizeHintRole);

	setModel(headerModel);

	connect(this, SIGNAL(sectionResized(int, int, int)), this, SLOT(onSectionResized(int,int,int)));
}

RbTableHeaderView::~RbTableHeaderView()
{
}

void RbTableHeaderView::setRowHeight(int row, int rowHeight)
{
	RbTableHeaderModel* md = qobject_cast<RbTableHeaderModel*>(model());
	const int cols = md->columnCount();
	for (int col=0;col<cols;++col)
	{
		QSize sz = md->index(row,col).data(Qt::SizeHintRole).toSize();
		sz.setHeight(rowHeight);
		md->setData(md->index(row,col),sz,Qt::SizeHintRole);
	}
	if (orientation() == Qt::Vertical)
		resizeSection(row,rowHeight);
}

void RbTableHeaderView::setColumnWidth(int col, int colWidth)
{
	RbTableHeaderModel* md = qobject_cast<RbTableHeaderModel*>(model());
	const int rows = md->rowCount();
	for (int row=0;row<rows;++row)
	{
		QSize sz = md->index(row,col).data(Qt::SizeHintRole).toSize();
		sz.setWidth(colWidth);
		md->setData(md->index(row,col),sz,Qt::SizeHintRole);
	}
	if (orientation() == Qt::Horizontal)
		resizeSection(col,colWidth);
}


void RbTableHeaderView::setSpan(int row, int column, int rowSpanCount, int columnSpanCount)
{
	RbTableHeaderModel* md = qobject_cast<RbTableHeaderModel*>(model());
	QModelIndex idx = md->index(row,column);
	if (rowSpanCount > 0)
	md->setData(idx,rowSpanCount,ROW_SPAN_ROLE);
	if (columnSpanCount)
	md->setData(idx,columnSpanCount,COLUMN_SPAN_ROLE);
}

void RbTableHeaderView::setCellBackgroundColor(const QModelIndex& index, const QColor& color)
{
	RbTableHeaderModel* md = qobject_cast<RbTableHeaderModel*>(model());
	md->setData(index,color,Qt::BackgroundRole);
}

void RbTableHeaderView::setCellForegroundColor(const QModelIndex& index, const QColor& color)
{
	RbTableHeaderModel* md = qobject_cast<RbTableHeaderModel*>(model());
	md->setData(index,color,Qt::ForegroundRole);
}


void RbTableHeaderView::mousePressEvent(QMouseEvent* event)
{
	QHeaderView::mousePressEvent(event);
	QPoint pos = event->pos();
	QModelIndex index = indexAt(pos);
	const int OTN = orientation();
	if (index.isValid())
	{
		int beginSection = -1;
		int endSection   = -1;
		int numbers = 0;
		numbers = getSectionRange(index,&beginSection,&endSection);
		if (numbers > 0)
		{
			emit sectionPressed(beginSection,endSection);
			return;
		}
		else
		{
			const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(this->model());
			const int LEVEL_CNT = (OTN == Qt::Horizontal)?tblModel->rowCount():tblModel->columnCount();
			int logicalIdx = (OTN == Qt::Horizontal)?index.column():index.row();
			int curLevel   = (OTN == Qt::Horizontal)?index.row():index.column();
			for (int i=0;i<LEVEL_CNT;++i)
			{
				QModelIndex cellIndex = (OTN == Qt::Horizontal)?tblModel->index(i,logicalIdx):tblModel->index(logicalIdx,i);
				numbers = getSectionRange(cellIndex,&beginSection,&endSection);
				if (numbers > 0)
				{
					if (beginSection <= logicalIdx && logicalIdx <= endSection)
					{
						int beginLevel = (OTN == Qt::Horizontal)?cellIndex.row():cellIndex.column();
						QVariant levelSpanCnt = cellIndex.data((OTN == Qt::Horizontal)?ROW_SPAN_ROLE:COLUMN_SPAN_ROLE);
						if (!levelSpanCnt.isValid())
							continue;
						int endLevel   = beginLevel + levelSpanCnt.toInt()-1;
						if (beginLevel <= curLevel && curLevel <= endLevel)
						{
					        emit sectionPressed(beginSection,endSection);
							 break;
						}
					}
				}
			}
		}
	}
}

QModelIndex RbTableHeaderView::indexAt(const QPoint& pos)
{
	const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(this->model());
	const int OTN = orientation();
	const int ROWS = tblModel->rowCount();
	const int COLS = tblModel->columnCount();
	int logicalIdx = logicalIndexAt(pos);

	if (OTN == Qt::Horizontal)
	{
		int dY=0;
		for (int row=0;row<ROWS;++row)
		{
			QModelIndex cellIndex = tblModel->index(row,logicalIdx);
			dY += cellIndex.data(Qt::SizeHintRole).toSize().height();
			if (pos.y() <= dY) return cellIndex;
		}
	}
	else
	{
		int dX=0;
		for (int col=0;col<COLS;++col)
		{
			QModelIndex cellIndex = tblModel->index(logicalIdx,col);
			dX += cellIndex.data(Qt::SizeHintRole).toSize().width();
			if (pos.x() <= dX) return cellIndex;
		}
	}

	return QModelIndex();
}

void RbTableHeaderView::paintSection(QPainter* painter, const QRect& rect, int logicalIdx) const
{
	const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(this->model());
	const int OTN = orientation();
	const int LEVEL_CNT = (OTN == Qt::Horizontal)?tblModel->rowCount():tblModel->columnCount();
	for (int i=0;i<LEVEL_CNT;++i)
	{
		QModelIndex cellIndex = (OTN == Qt::Horizontal)?tblModel->index(i,logicalIdx):tblModel->index(logicalIdx,i);
		QSize cellSize=cellIndex.data(Qt::SizeHintRole).toSize();
		QRect sectionRect(rect);

		// set position of the cell
		if (OTN == Qt::Horizontal)
			sectionRect.setTop(rowSpanSize(logicalIdx,0,i)); // distance from 0 to i-1 rows
		else
			sectionRect.setLeft(columnSpanSize(logicalIdx,0,i));

		sectionRect.setSize(cellSize);

		// check up span column or row
		QModelIndex colSpanIdx = columnSpanIndex(cellIndex);
		QModelIndex rowSpanIdx = rowSpanIndex(cellIndex);
		if (colSpanIdx.isValid())
		{
			int colSpanFrom = colSpanIdx.column();
			int colSpanCnt  = colSpanIdx.data(COLUMN_SPAN_ROLE).toInt();
			int colSpanTo   = colSpanFrom+colSpanCnt-1;
			int colSpan     = columnSpanSize(cellIndex.row(),colSpanFrom,colSpanCnt);
			if (OTN == Qt::Horizontal)
				sectionRect.setLeft(sectionViewportPosition(colSpanFrom));
			else
			{
				sectionRect.setLeft(columnSpanSize(logicalIdx,0,colSpanFrom));
				i = colSpanTo;
			}

			sectionRect.setWidth(colSpan);

			// check up  if the column span index has row span
			QVariant subRowSpanData = colSpanIdx.data(ROW_SPAN_ROLE);
			if (subRowSpanData.isValid())
			{
				int subRowSpanFrom = colSpanIdx.row();
				int subRowSpanCnt  = subRowSpanData.toInt();
				int subRowSpanTo   = subRowSpanFrom+subRowSpanCnt-1;
				int subRowSpan     = rowSpanSize(colSpanFrom,subRowSpanFrom,subRowSpanCnt);
				if (OTN == Qt::Vertical)
					sectionRect.setTop(sectionViewportPosition(subRowSpanFrom));
				else
				{
					sectionRect.setTop(rowSpanSize(colSpanFrom,0,subRowSpanFrom));
					i = subRowSpanTo;
				}
				sectionRect.setHeight(subRowSpan);
			}
			cellIndex=colSpanIdx;
		}
		if (rowSpanIdx.isValid())
		{
			int rowSpanFrom = rowSpanIdx.row();
			int rowSpanCnt  = rowSpanIdx.data(ROW_SPAN_ROLE).toInt();
			int rowSpanTo   = rowSpanFrom+rowSpanCnt-1;
			int rowSpan     = rowSpanSize(cellIndex.column(),rowSpanFrom,rowSpanCnt);
			if (OTN == Qt::Vertical)
				sectionRect.setTop(sectionViewportPosition(rowSpanFrom));
			else
			{
				sectionRect.setTop(rowSpanSize(logicalIdx,0,rowSpanFrom));
				i = rowSpanTo;
			}
			sectionRect.setHeight(rowSpan);

			// check up if the row span index has column span
			QVariant subColSpanData = rowSpanIdx.data(COLUMN_SPAN_ROLE);
			if (subColSpanData.isValid())
			{
				int subColSpanFrom = rowSpanIdx.column();
				int subColSpanCnt  = subColSpanData.toInt();
				int subColSpanTo   = subColSpanFrom+subColSpanCnt-1;
				int subColSpan     = columnSpanSize(rowSpanFrom,subColSpanFrom,subColSpanCnt);
				if (OTN == Qt::Horizontal)
					sectionRect.setLeft(sectionViewportPosition(subColSpanFrom));
				else
				{
					sectionRect.setLeft(columnSpanSize(rowSpanFrom,0,subColSpanFrom));
					i = subColSpanTo;
				}
				sectionRect.setWidth(subColSpan);
			}
			cellIndex=rowSpanIdx;
		}

		// draw section with style
		QStyleOptionHeader sectionStyle;
		initStyleOption(&sectionStyle);
		sectionStyle.textAlignment = Qt::AlignCenter;
		sectionStyle.iconAlignment = Qt::AlignVCenter;
		sectionStyle.section = logicalIdx;
		sectionStyle.text = cellIndex.data(Qt::DisplayRole).toString();
		sectionStyle.rect = sectionRect;

		// file background or foreground color of the cell
		QVariant bg = cellIndex.data(Qt::BackgroundRole);
		QVariant fg = cellIndex.data(Qt::ForegroundRole);
		if (qVariantCanConvert<QBrush>(bg))
		{
			sectionStyle.palette.setBrush(QPalette::Button, qvariant_cast<QBrush>(bg));
			sectionStyle.palette.setBrush(QPalette::Window, qvariant_cast<QBrush>(bg));
		}
		if (qVariantCanConvert<QBrush>(fg))
		{
			sectionStyle.palette.setBrush(QPalette::ButtonText, qvariant_cast<QBrush>(fg));
		}

		painter->save();
		qDrawShadePanel(painter,sectionStyle.rect,sectionStyle.palette,false,1,&sectionStyle.palette.brush(QPalette::Button));
		style()->drawControl(QStyle::CE_HeaderLabel, &sectionStyle, painter);
		painter->restore();
	}
}

QSize RbTableHeaderView::sectionSizeFromContents(int logicalIndex) const
{
	const RbTableHeaderModel* tblModel = qobject_cast<const RbTableHeaderModel*>(this->model());
	const int OTN = orientation();
	const int LEVEL_CNT = (OTN == Qt::Horizontal)?tblModel->rowCount():tblModel->columnCount();

	QSize siz = QHeaderView::sectionSizeFromContents(logicalIndex);
	for (int i=0;i<LEVEL_CNT;++i)
	{
		QModelIndex cellIndex = (OTN == Qt::Horizontal)?tblModel->index(i,logicalIndex):tblModel->index(logicalIndex,i);
		QModelIndex colSpanIdx = columnSpanIndex(cellIndex);
		QModelIndex rowSpanIdx = rowSpanIndex(cellIndex);
		siz=cellIndex.data(Qt::SizeHintRole).toSize();

		if (colSpanIdx.isValid())
		{
			int colSpanFrom = colSpanIdx.column();
			int colSpanCnt     = colSpanIdx.data(COLUMN_SPAN_ROLE).toInt();
			int colSpanTo   = colSpanFrom + colSpanCnt -1;
			siz.setWidth(columnSpanSize(colSpanIdx.row(),colSpanFrom,colSpanCnt));
			if (OTN == Qt::Vertical) i = colSpanTo;
		}
		if (rowSpanIdx.isValid())
		{
			int rowSpanFrom = rowSpanIdx.row();
			int rowSpanCnt  = rowSpanIdx.data(ROW_SPAN_ROLE).toInt();
			int rowSpanTo   = rowSpanFrom + rowSpanCnt-1;
			siz.setHeight(rowSpanSize(rowSpanIdx.column(),rowSpanFrom,rowSpanCnt));
			if (OTN == Qt::Horizontal) i = rowSpanTo;
		}
	}
	return siz;
}

QModelIndex RbTableHeaderView::columnSpanIndex(const QModelIndex& currentIdx) const
{
	const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(model());
	const int curRow = currentIdx.row();
	const int curCol = currentIdx.column();
	int i = curCol;
	while (i >= 0)
	{
	   QModelIndex spanIndex = tblModel->index(curRow,i);
		QVariant span   = spanIndex.data(COLUMN_SPAN_ROLE);
		if (span.isValid() && spanIndex.column()+span.toInt()-1 >= curCol)
			return spanIndex;
		i--;
	}
	return QModelIndex();
}

QModelIndex RbTableHeaderView::rowSpanIndex(const QModelIndex& currentIdx) const
{
	const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(model());
	const int curRow = currentIdx.row();
	const int curCol = currentIdx.column();
	int i = curRow;
	while (i >= 0)
	{
		QModelIndex spanIndex = tblModel->index(i,curCol);
		QVariant span   = spanIndex.data(ROW_SPAN_ROLE);
		if (span.isValid() && spanIndex.row()+span.toInt()-1 >= curRow)
			return spanIndex;
		i--;
	}
	return QModelIndex();
}

int RbTableHeaderView::columnSpanSize(int row, int from, int spanCount) const
{
	const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(model());
	int span = 0;
	for (int i=from;i<from+spanCount;++i)
	{
		QSize cellSize = tblModel->index(row,i).data(Qt::SizeHintRole).toSize();
		span += cellSize.width();
	}
	return span;
}


int RbTableHeaderView::rowSpanSize(int column, int from, int spanCount) const
{
	const RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(model());
	int span = 0;
	for (int i=from;i<from+spanCount;++i)
	{
		QSize cellSize = tblModel->index(i,column).data(Qt::SizeHintRole).toSize();
		span += cellSize.height();
	}
	return span;
}

/**
 * @return section numbers
 */
int RbTableHeaderView::getSectionRange(QModelIndex& index, int* beginSection, int* endSection) const
{
	// check up section range from the index
	QModelIndex colSpanIdx = columnSpanIndex(index);
	QModelIndex rowSpanIdx = rowSpanIndex(index);

	if (colSpanIdx.isValid())
	{
		int colSpanFrom = colSpanIdx.column();
		int colSpanCnt  = colSpanIdx.data(COLUMN_SPAN_ROLE).toInt();
		int colSpanTo   = colSpanFrom+colSpanCnt-1;
		if (orientation() == Qt::Horizontal)
		{
			*beginSection = colSpanFrom;
			*endSection   = colSpanTo;
			index = colSpanIdx;
			return colSpanCnt;
		}
		else
		{
			// check up  if the column span index has row span
			QVariant subRowSpanData = colSpanIdx.data(ROW_SPAN_ROLE);
			if (subRowSpanData.isValid())
			{
				int subRowSpanFrom = colSpanIdx.row();
				int subRowSpanCnt  = subRowSpanData.toInt();
				int subRowSpanTo   = subRowSpanFrom+subRowSpanCnt-1;
				*beginSection = subRowSpanFrom;
				*endSection   = subRowSpanTo;
				index = colSpanIdx;
				return subRowSpanCnt;
			}
		}
	}

	if (rowSpanIdx.isValid())
	{
		int rowSpanFrom = rowSpanIdx.row();
		int rowSpanCnt  = rowSpanIdx.data(ROW_SPAN_ROLE).toInt();
		int rowSpanTo   = rowSpanFrom+rowSpanCnt-1;
		if (orientation() == Qt::Vertical)
		{
			*beginSection = rowSpanFrom;
			*endSection   = rowSpanTo;
			index = rowSpanIdx;
			return rowSpanCnt;
		}
		else
		{
			// check up if the row span index has column span
			QVariant subColSpanData = rowSpanIdx.data(COLUMN_SPAN_ROLE);
			if (subColSpanData.isValid())
			{
				int subColSpanFrom = rowSpanIdx.column();
				int subColSpanCnt  = subColSpanData.toInt();
				int subColSpanTo   = subColSpanFrom+subColSpanCnt-1;
				*beginSection = subColSpanFrom;
				*endSection   = subColSpanTo;
				index = rowSpanIdx;
				return subColSpanCnt;
			}
		}
	}

	return 0;
}


void RbTableHeaderView::onSectionResized(int logicalIndex,int oldSize,int newSize)
{
	RbTableHeaderModel* tblModel = qobject_cast<RbTableHeaderModel*>(this->model());
	const int OTN = orientation();
	const int LEVEL_CNT = (OTN == Qt::Horizontal)?tblModel->rowCount():tblModel->columnCount();
	int pos = sectionViewportPosition(logicalIndex);
	int xx  = (OTN == Qt::Horizontal)?pos:0;
	int yy  = (OTN == Qt::Horizontal)?0:pos;
	QRect sectionRect(xx,yy,0,0);
	for (int i=0;i<LEVEL_CNT;++i)
	{
		QModelIndex cellIndex = (OTN == Qt::Horizontal)?tblModel->index(i,logicalIndex):tblModel->index(logicalIndex,i);
		QSize cellSize=cellIndex.data(Qt::SizeHintRole).toSize();
		// set position of cell
		if (OTN == Qt::Horizontal)
		{
			sectionRect.setTop(rowSpanSize(logicalIndex,0,i));
			cellSize.setWidth(newSize);
		}
		else
		{
			sectionRect.setLeft(columnSpanSize(logicalIndex,0,i));
			cellSize.setHeight(newSize);
		}
		tblModel->setData(cellIndex,cellSize,Qt::SizeHintRole);

		QModelIndex colSpanIdx = columnSpanIndex(cellIndex);
		QModelIndex rowSpanIdx = rowSpanIndex(cellIndex);

		if (colSpanIdx.isValid())
		{
			int colSpanFrom = colSpanIdx.column();
			if (OTN == Qt::Horizontal)
				sectionRect.setLeft(sectionViewportPosition(colSpanFrom));
			else
			{
				sectionRect.setLeft(columnSpanSize(logicalIndex,0,colSpanFrom));
			}

		}
		if (rowSpanIdx.isValid())
		{
			int rowSpanFrom = rowSpanIdx.row();
			if (OTN == Qt::Vertical)
				sectionRect.setTop(sectionViewportPosition(rowSpanFrom));
			else
				sectionRect.setTop(rowSpanSize(logicalIndex,0,rowSpanFrom));
		}
		QRect rToUpdate(sectionRect);
		rToUpdate.setWidth(viewport()->width()-sectionRect.left());
		rToUpdate.setHeight(viewport()->height()-sectionRect.top());
		viewport()->update(rToUpdate.normalized());
	}
}
